scholarly journals Review on the Current State of Developing of Advanced Creep Damage Constitutive Equations for High Chromium Alloy

2012 ◽  
Vol 510 ◽  
pp. 776-780 ◽  
Author(s):  
Li Li An ◽  
Qiang Xu ◽  
Dong Lai Xu ◽  
Zhong Yu Lu

This paper presents a review of developing of creep damage constitutive equations for high chromium alloy (such as P91 alloy). Firstly, it briefly introduces the background of creep damage for P91 materials. Then, it summarizes the typical creep damage constitutive equations developed and applied for P91 alloy, and the main deficiencies of KRH (Kachanov-Robatnov-Hayhurst) type and Xus type constitutive equations. Finally it suggests the directions for future work. This paper contributes to the knowledge for the developing creep damage constitutive equations for the specific material.

2012 ◽  
Vol 510 ◽  
pp. 812-816 ◽  
Author(s):  
Qi Hua Xu ◽  
Qiang Xu ◽  
Yong Xin Pan ◽  
Michael Short

This paper reports a critical summary of literature review of creep damage constitutive equations. Firstly, it introduces the general background on the creep damage in low alloy stainless steel and weldment. Then, it summarizes the typical creep damage constitutive equations for this material available from public literature and discusses the deficiencies existed in the popular creep damage constitutive equations. Finally it outlines the approach to be used in the developing a new set of creep damage constitutive equation and the directions of future work.


Alloy Digest ◽  
2000 ◽  
Vol 49 (7) ◽  

Abstract Nirosta 4465 is a low-carbon, high-chromium alloy with nickel and molybdenum. It has good corrosion and intergranular corrosion resistance. The alloy is used for processing phosphate rock. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as fracture toughness. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SS-797. Producer or source: ThyssenKrupp Nirosta.


Author(s):  
Paul B. Miller

This chapter charts new frontiers of scholarly inquiry in fiduciary law. The chapter first orients the reader by taking stock of the current state of play in fiduciary scholarship. It then identifies a range of important questions that should inspire future work in the field. More specifically, it identifies pressing questions of legal theory (conceptual and normative analysis), economic and empirical legal studies (including classical and behavioral economic analysis), and historical and sociological inquiry. The chapter also raises questions of interest to private law theorists and scholars interested in exploring the significance of fiduciary principles within various subfields, from trust and corporate law to health law and legal ethics.


2015 ◽  
Vol 750 ◽  
pp. 266-271 ◽  
Author(s):  
Yu Zhou ◽  
Xue Dong Chen ◽  
Zhi Chao Fan ◽  
Yi Chun Han

The creep behavior of 2.25Cr-1Mo-0.25V ferritic steel was investigated using a set of physically-based creep damage constitutive equations. The material constants were determined according to the creep experimental data, using an efficient genetic algorithm. The user-defined subroutine for creep damage evolution was developed based on the commercial finite element software ANSYS and its user programmable features (UPFs), and the numerical simulation of the stress distribution and the damage evolution of the semi V-type notched specimen during creep were studied. The results showed that the genetic algorithm is a very efficient optimization approach for the parameter identification of the creep damage constitutive equations, and finite element simulation based on continuum damage mechanics can be used to analyze and predict the creep damage evolution under multi-axial stress states.


1988 ◽  
Vol 55 (1) ◽  
pp. 1-10 ◽  
Author(s):  
E. T. Onat ◽  
F. A. Leckie

The paper is concerned with the representation of the relationship that exists, for a given material and temperature and for small deformations, between histories of applied stress and the observed strain and the accompanying changes in internal structure of the material. Emphasis is given to creep damage in metals as a vehicle for illustration of the main ideas introduced in the paper. In particular, the role played by irreducible even rank tensors in the representation of internal structure is discussed and clarified. The restrictions placed by thermodynamics on constitutive equations are considered and the use of potentials in these equations is examined and criticized.


2018 ◽  
Vol 10 (2) ◽  
pp. 122-140
Author(s):  
Vitaly I Sidorenko

The author explains the conditions and reasons for the introduction in 2003 a new major, that is Film and Television Producer into the list of Media Majors for which the students are trained in higher educational institutions for the domestic industry. The article points out the goals and tasks for developers of normative and methodological materials required for the introduction of such a major, the functional responsibilities and skills of the producer in audiovisual industry and the main features of his/her activities as compared to the classical entrepreneurship skill set. The author presents the list of learning outcomes and the tasks a graduate who has mastered the curriculum of the Producer program should solve. A highlight of the article is given to the legal basis for ensuring the activities of the producer. Besides, the professional standard of "Film Producer", approved by the Ministry of Labor and Social Protection of the Russian Federation, is critically evaluated. Basing on the analysis of the current state of the national film business the author reflects on the problems and challenges the system of professional training of producers, faces and outlines the prospects for the future work. These problems demand further diversification of Film Majors including the introduction of a new one called Producer of distribution. Moreover, its necessary to determine the optimal number of students, to write the teaching aids and textbooks aimed at solving practical problems existing in film business and multimedia and mastering the current students skills. The author states that one of the most crucial problems in the system of producer training is the unresolved issue of financial support of the diploma project (a film shot by a graduate). The author offers his own system of the development of a diploma film, which will allow us to give a more realistic and deeper assessment of the abilities, skills and knowledge of a future film-maker. The second half of the article gives a brief overview of the current state of cinema, television and multimedia in Europe and determines, in this respect, the main directions for improving the system of professional training of producers in European film schools, taking into consideration the new industrial context. The fact that the changing industrial context makes producers seek for new ways to reduce uncertainty and risks, attracting external investors and co-producers, is particularly stressed. The author also reflects on the problem of the so-called TV-ization of a film, which has set absolutely new tasks in front of the producers and creators of audiovisual product. In conclusion, the author presents a summary of the main principles, methods and approaches to structuring the educational process while teaching students the Major "Film and Television Producer" at the Film University Babelsberg named after Konrad Wolf. The author appreciates the experience of German colleagues, which can be implemented into domestic practice.


2008 ◽  
Vol 74 (739) ◽  
pp. 323-328 ◽  
Author(s):  
Kazunari FUJIYAMA ◽  
Keita MORI ◽  
Daisuke KANEKO ◽  
Takahide MATSUNAGA ◽  
Hirohisa KIMACHI

2013 ◽  
Vol 5 (1) ◽  
pp. 53-63 ◽  
Author(s):  
Alfredo Tirado-Ramos ◽  
Chris Kelley

Simulating the transmission of HIV requires a model framework that can account for the complex nature of HIV transmission. In this paper the authors present the current state of the art for simulating HIV with agent-based models and highlight some of the significant contributions of current research. The authors then propose opportunities for future work including their plan that involves identifying and monitoring high-risk drug users that can potentially initiate high-risk infection propagation networks.


Sign in / Sign up

Export Citation Format

Share Document